Troffer lighting fixture



FIG. 1 is a plan side view of a troffer lighting fixture showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a bottom perspective view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a top perspective view thereof. 

CLAIM The ornamental design for a troffer lighting fixture, as shown and described. 